"Jerry Mahlman, a leading climatologist who for many years headed the NOAA Geophysical Fluid Dyamics Lab, died on November 28. In the 1990s I saw him play a pioneering role in interpreting the science of global warming to policymakers and the public. In 2006, in comments we posted, he called out NOAA Administrator Lautenbacher for political interference with science communication at his agency. A sad loss of a terrific guy and a great asset to the community."